These are some applications you can use

1. WordWeb - dictionary to be downloaded to your computer - with synonyms and pronunciation:
http://wordweb.info/free/Wordweb

2. WordDynamo: Glossary list that you can create, with exercises and pronunciation.
http://dynamo.dictionary.com/

3. SoundCloud: you can record and or upload recordings and embed them in your wiki.
https://soundcloud.com

4. AudioPal: you can record, upload recordings, embed, and also use the text-to-speech application to listen to pronunciation before recording:
http://www.audiopal.com/


Dafne - Skype: dafnegon939